Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetalpha.html @ 3896:1a327643e741 SDL-1.2
X11 backend: tell app that mouse focus has been obtained when grabbing the
input. This allows us to enable DGA mode, even when the system cursor was
outside of the window when the grab was initiated.
Fixes Bugzilla #299, which has a more detailed explanation of the issue.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 13 Nov 2006 03:58:22 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetAlpha</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Video" | |
| 14 HREF="video.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_SetColorKey" | |
| 17 HREF="sdlsetcolorkey.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SetClipRect" | |
| 20 HREF="sdlsetcliprect.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
|
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31 SUMMARY="Header navigation table" |
| 0 | 32 WIDTH="100%" |
| 33 BORDER="0" | |
| 34 CELLPADDING="0" | |
| 35 CELLSPACING="0" | |
| 36 ><TR | |
| 37 ><TH | |
| 38 COLSPAN="3" | |
| 39 ALIGN="center" | |
| 40 >SDL Library Documentation</TH | |
| 41 ></TR | |
| 42 ><TR | |
| 43 ><TD | |
| 44 WIDTH="10%" | |
| 45 ALIGN="left" | |
| 46 VALIGN="bottom" | |
| 47 ><A | |
| 48 HREF="sdlsetcolorkey.html" | |
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49 ACCESSKEY="P" |
| 0 | 50 >Prev</A |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="80%" | |
| 54 ALIGN="center" | |
| 55 VALIGN="bottom" | |
| 56 ></TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="sdlsetcliprect.html" | |
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63 ACCESSKEY="N" |
| 0 | 64 >Next</A |
| 65 ></TD | |
| 66 ></TR | |
| 67 ></TABLE | |
| 68 ><HR | |
| 69 ALIGN="LEFT" | |
| 70 WIDTH="100%"></DIV | |
| 71 ><H1 | |
| 72 ><A | |
| 73 NAME="SDLSETALPHA" | |
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74 ></A |
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75 >SDL_SetAlpha</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2096" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SetAlpha -- Adjust the alpha properties of a surface</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2099" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2100" |
| 0 | 95 ></A |
| 96 ><P | |
| 97 ></P | |
| 98 ><PRE | |
| 99 CLASS="FUNCSYNOPSISINFO" | |
| 100 >#include "SDL.h"</PRE | |
| 101 ><P | |
| 102 ><CODE | |
| 103 ><CODE | |
| 104 CLASS="FUNCDEF" | |
| 105 >int <B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_SetAlpha</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2106" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><DIV | |
| 123 CLASS="NOTE" | |
| 124 ><BLOCKQUOTE | |
| 125 CLASS="NOTE" | |
| 126 ><P | |
| 127 ><B | |
| 128 >Note: </B | |
| 129 >This function and the semantics of SDL alpha blending have changed since version 1.1.4. Up until version 1.1.5, an alpha value of 0 was considered opaque and a value of 255 was considered transparent. This has now been inverted: 0 (<TT | |
| 130 CLASS="LITERAL" | |
| 131 >SDL_ALPHA_TRANSPARENT</TT | |
| 132 >) is now considered transparent and 255 (<TT | |
| 133 CLASS="LITERAL" | |
| 134 >SDL_ALPHA_OPAQUE</TT | |
| 135 >) is now considered opaque.</P | |
| 136 ></BLOCKQUOTE | |
| 137 ></DIV | |
| 138 ><P | |
| 139 ><TT | |
| 140 CLASS="FUNCTION" | |
| 141 >SDL_SetAlpha</TT | |
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142 > is used for setting the per-surface alpha |
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143 value and/or enabling and disabling alpha blending.</P |
| 0 | 144 ><P |
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145 >The<TT |
| 0 | 146 CLASS="PARAMETER" |
| 147 ><I | |
| 148 >surface</I | |
| 149 ></TT | |
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150 > parameter specifies which surface whose alpha |
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151 attributes you wish to adjust. <TT |
| 0 | 152 CLASS="PARAMETER" |
| 153 ><I | |
| 154 >flags</I | |
| 155 ></TT | |
|
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156 > is used to specify |
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157 whether alpha blending should be used (<TT |
| 0 | 158 CLASS="LITERAL" |
| 159 >SDL_SRCALPHA</TT | |
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160 >) and |
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161 whether the surface should use RLE acceleration for blitting |
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162 (<TT |
| 0 | 163 CLASS="LITERAL" |
| 164 >SDL_RLEACCEL</TT | |
| 165 >). <TT | |
| 166 CLASS="PARAMETER" | |
| 167 ><I | |
| 168 >flags</I | |
| 169 ></TT | |
|
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170 > can be an OR'd |
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171 combination of these two options, one of these options or 0. If |
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172 <TT |
| 0 | 173 CLASS="LITERAL" |
| 174 >SDL_SRCALPHA</TT | |
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175 > is not passed as a flag then all alpha |
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176 information is ignored when blitting the surface. The |
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177 <TT |
| 0 | 178 CLASS="PARAMETER" |
| 179 ><I | |
| 180 >alpha</I | |
| 181 ></TT | |
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182 > parameter is the per-surface alpha value; a |
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183 surface need not have an alpha channel to use per-surface alpha and blitting |
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184 can still be accelerated with <TT |
| 0 | 185 CLASS="LITERAL" |
| 186 >SDL_RLEACCEL</TT | |
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187 >.</P |
| 0 | 188 ><DIV |
| 189 CLASS="NOTE" | |
| 190 ><BLOCKQUOTE | |
| 191 CLASS="NOTE" | |
| 192 ><P | |
| 193 ><B | |
| 194 >Note: </B | |
|
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195 >The per-surface alpha value of 128 is considered a special case and |
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196 is optimised, so it's much faster than other per-surface values.</P |
| 0 | 197 ></BLOCKQUOTE |
| 198 ></DIV | |
| 199 ><P | |
| 200 >Alpha effects surface blitting in the following ways:</P | |
| 201 ><DIV | |
| 202 CLASS="INFORMALTABLE" | |
| 203 ><A | |
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204 NAME="AEN2126" |
| 0 | 205 ></A |
| 206 ><P | |
| 207 ></P | |
| 208 ><TABLE | |
| 209 BORDER="0" | |
| 210 CLASS="CALSTABLE" | |
| 211 ><TBODY | |
| 212 ><TR | |
| 213 ><TD | |
| 214 ALIGN="LEFT" | |
| 215 VALIGN="TOP" | |
| 216 >RGBA->RGB with <TT | |
| 217 CLASS="LITERAL" | |
| 218 >SDL_SRCALPHA</TT | |
| 219 ></TD | |
| 220 ><TD | |
| 221 ALIGN="LEFT" | |
| 222 VALIGN="TOP" | |
| 223 ><P | |
| 224 >The source is alpha-blended with the destination, using the alpha channel. <TT | |
| 225 CLASS="LITERAL" | |
| 226 >SDL_SRCCOLORKEY</TT | |
| 227 > and the per-surface alpha are ignored.</P | |
| 228 ></TD | |
| 229 ></TR | |
| 230 ><TR | |
| 231 ><TD | |
| 232 ALIGN="LEFT" | |
| 233 VALIGN="TOP" | |
| 234 >RGBA->RGB without <TT | |
| 235 CLASS="LITERAL" | |
| 236 >SDL_SRCALPHA</TT | |
| 237 ></TD | |
| 238 ><TD | |
| 239 ALIGN="LEFT" | |
| 240 VALIGN="TOP" | |
| 241 ><P | |
| 242 >The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P | |
| 243 ></TD | |
| 244 ></TR | |
| 245 ><TR | |
| 246 ><TD | |
| 247 ALIGN="LEFT" | |
| 248 VALIGN="TOP" | |
| 249 >RGB->RGBA with <TT | |
| 250 CLASS="LITERAL" | |
| 251 >SDL_SRCALPHA</TT | |
| 252 ></TD | |
| 253 ><TD | |
| 254 ALIGN="LEFT" | |
| 255 VALIGN="TOP" | |
| 256 ><P | |
|
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257 >The source is alpha-blended with the destination using the per-surface alpha |
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258 value. If <TT |
| 0 | 259 CLASS="LITERAL" |
| 260 >SDL_SRCCOLORKEY</TT | |
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261 > is set, only the pixels not |
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262 matching the colorkey value are copied. The alpha channel of the copied pixels |
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263 is set to opaque.</P |
| 0 | 264 ></TD |
| 265 ></TR | |
| 266 ><TR | |
| 267 ><TD | |
| 268 ALIGN="LEFT" | |
| 269 VALIGN="TOP" | |
| 270 >RGB->RGBA without <TT | |
| 271 CLASS="LITERAL" | |
| 272 >SDL_SRCALPHA</TT | |
| 273 ></TD | |
| 274 ><TD | |
| 275 ALIGN="LEFT" | |
| 276 VALIGN="TOP" | |
| 277 ><P | |
|
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278 >The RGB data is copied from the source and the alpha value of the copied pixels |
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279 is set to opaque. If <TT |
| 0 | 280 CLASS="LITERAL" |
| 281 >SDL_SRCCOLORKEY</TT | |
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282 > is set, only the pixels |
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283 not matching the colorkey value are copied. </P |
| 0 | 284 ></TD |
| 285 ></TR | |
| 286 ><TR | |
| 287 ><TD | |
| 288 ALIGN="LEFT" | |
| 289 VALIGN="TOP" | |
| 290 >RGBA->RGBA with <TT | |
| 291 CLASS="LITERAL" | |
| 292 >SDL_SRCALPHA</TT | |
| 293 ></TD | |
| 294 ><TD | |
| 295 ALIGN="LEFT" | |
| 296 VALIGN="TOP" | |
| 297 ><P | |
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298 >The source is alpha-blended with the destination using the source alpha |
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299 channel. The alpha channel in the destination surface is left untouched. |
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300 <TT |
| 0 | 301 CLASS="LITERAL" |
| 302 >SDL_SRCCOLORKEY</TT | |
| 303 > is ignored.</P | |
| 304 ></TD | |
| 305 ></TR | |
| 306 ><TR | |
| 307 ><TD | |
| 308 ALIGN="LEFT" | |
| 309 VALIGN="TOP" | |
| 310 >RGBA->RGBA without <TT | |
| 311 CLASS="LITERAL" | |
| 312 >SDL_SRCALPHA</TT | |
| 313 ></TD | |
| 314 ><TD | |
| 315 ALIGN="LEFT" | |
| 316 VALIGN="TOP" | |
| 317 ><P | |
| 318 >The RGBA data is copied to the destination surface. If <TT | |
| 319 CLASS="LITERAL" | |
| 320 >SDL_SRCCOLORKEY</TT | |
| 321 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 322 ></TD | |
| 323 ></TR | |
| 324 ><TR | |
| 325 ><TD | |
| 326 ALIGN="LEFT" | |
| 327 VALIGN="TOP" | |
| 328 >RGB->RGB with <TT | |
| 329 CLASS="LITERAL" | |
| 330 >SDL_SRCALPHA</TT | |
| 331 ></TD | |
| 332 ><TD | |
| 333 ALIGN="LEFT" | |
| 334 VALIGN="TOP" | |
| 335 ><P | |
| 336 >The source is alpha-blended with the destination using the per-surface alpha value. If <TT | |
| 337 CLASS="LITERAL" | |
| 338 >SDL_SRCCOLORKEY</TT | |
| 339 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 340 ></TD | |
| 341 ></TR | |
| 342 ><TR | |
| 343 ><TD | |
| 344 ALIGN="LEFT" | |
| 345 VALIGN="TOP" | |
| 346 >RGB->RGB without <TT | |
| 347 CLASS="LITERAL" | |
| 348 >SDL_SRCALPHA</TT | |
| 349 ></TD | |
| 350 ><TD | |
| 351 ALIGN="LEFT" | |
| 352 VALIGN="TOP" | |
| 353 ><P | |
| 354 >The RGB data is copied from the source. If <TT | |
| 355 CLASS="LITERAL" | |
| 356 >SDL_SRCCOLORKEY</TT | |
| 357 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 358 ></TD | |
| 359 ></TR | |
| 360 ></TBODY | |
| 361 ></TABLE | |
| 362 ><P | |
| 363 ></P | |
| 364 ></DIV | |
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365 ><DIV |
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366 CLASS="NOTE" |
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367 ><BLOCKQUOTE |
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368 CLASS="NOTE" |
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369 ><P |
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370 ><B |
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371 >Note: </B |
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372 > Note that RGBA->RGBA blits (with SDL_SRCALPHA set) keep the alpha |
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373 of the destination surface. This means that you cannot compose two arbitrary |
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374 RGBA surfaces this way and get the result you would expect from "overlaying" |
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375 them; the destination alpha will work as a mask.</P |
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376 ><P |
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377 >Also note that per-pixel and per-surface alpha cannot be combined; |
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378 the per-pixel alpha is always used if available</P |
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379 ></BLOCKQUOTE |
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380 ></DIV |
| 0 | 381 ></DIV |
| 382 ><DIV | |
| 383 CLASS="REFSECT1" | |
| 384 ><A | |
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385 NAME="AEN2179" |
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386 ></A |
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387 ><H2 |
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388 >Return Value</H2 |
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389 ><P |
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390 >This function returns <SPAN |
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391 CLASS="RETURNVALUE" |
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392 >0</SPAN |
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393 >, or |
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394 <SPAN |
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395 CLASS="RETURNVALUE" |
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396 >-1</SPAN |
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397 > if there was an error.</P |
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398 ></DIV |
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399 ><DIV |
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400 CLASS="REFSECT1" |
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401 ><A |
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402 NAME="AEN2184" |
| 0 | 403 ></A |
| 404 ><H2 | |
| 405 >See Also</H2 | |
| 406 ><P | |
| 407 ><A | |
| 408 HREF="sdlmaprgba.html" | |
| 409 ><TT | |
| 410 CLASS="FUNCTION" | |
| 411 >SDL_MapRGBA</TT | |
| 412 ></A | |
| 413 >, | |
| 414 <A | |
| 415 HREF="sdlgetrgba.html" | |
| 416 ><TT | |
| 417 CLASS="FUNCTION" | |
| 418 >SDL_GetRGBA</TT | |
| 419 ></A | |
| 420 >, | |
| 421 <A | |
| 422 HREF="sdldisplayformatalpha.html" | |
| 423 ><TT | |
| 424 CLASS="FUNCTION" | |
| 425 >SDL_DisplayFormatAlpha</TT | |
| 426 ></A | |
| 427 >, | |
| 428 <A | |
| 429 HREF="sdlblitsurface.html" | |
| 430 ><TT | |
| 431 CLASS="FUNCTION" | |
| 432 >SDL_BlitSurface</TT | |
| 433 ></A | |
| 434 ></P | |
| 435 ></DIV | |
| 436 ><DIV | |
| 437 CLASS="NAVFOOTER" | |
| 438 ><HR | |
| 439 ALIGN="LEFT" | |
| 440 WIDTH="100%"><TABLE | |
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441 SUMMARY="Footer navigation table" |
| 0 | 442 WIDTH="100%" |
| 443 BORDER="0" | |
| 444 CELLPADDING="0" | |
| 445 CELLSPACING="0" | |
| 446 ><TR | |
| 447 ><TD | |
| 448 WIDTH="33%" | |
| 449 ALIGN="left" | |
| 450 VALIGN="top" | |
| 451 ><A | |
| 452 HREF="sdlsetcolorkey.html" | |
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453 ACCESSKEY="P" |
| 0 | 454 >Prev</A |
| 455 ></TD | |
| 456 ><TD | |
| 457 WIDTH="34%" | |
| 458 ALIGN="center" | |
| 459 VALIGN="top" | |
| 460 ><A | |
| 461 HREF="index.html" | |
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462 ACCESSKEY="H" |
| 0 | 463 >Home</A |
| 464 ></TD | |
| 465 ><TD | |
| 466 WIDTH="33%" | |
| 467 ALIGN="right" | |
| 468 VALIGN="top" | |
| 469 ><A | |
| 470 HREF="sdlsetcliprect.html" | |
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471 ACCESSKEY="N" |
| 0 | 472 >Next</A |
| 473 ></TD | |
| 474 ></TR | |
| 475 ><TR | |
| 476 ><TD | |
| 477 WIDTH="33%" | |
| 478 ALIGN="left" | |
| 479 VALIGN="top" | |
| 480 >SDL_SetColorKey</TD | |
| 481 ><TD | |
| 482 WIDTH="34%" | |
| 483 ALIGN="center" | |
| 484 VALIGN="top" | |
| 485 ><A | |
| 486 HREF="video.html" | |
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487 ACCESSKEY="U" |
| 0 | 488 >Up</A |
| 489 ></TD | |
| 490 ><TD | |
| 491 WIDTH="33%" | |
| 492 ALIGN="right" | |
| 493 VALIGN="top" | |
| 494 >SDL_SetClipRect</TD | |
| 495 ></TR | |
| 496 ></TABLE | |
| 497 ></DIV | |
| 498 ></BODY | |
| 499 ></HTML | |
| 500 > |